examples/muxing: misc style fixes

misc style fixes.
Reviewed-by: Steven Liu <liuqi05@kuaishou.com>
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>

doc/examples/muxing.c

@@ -200,7 +200,7 @@ static void add_stream(OutputStream *ost, AVFormatContext *oc,
              * the motion of the chroma plane does not match the luma plane. */
             c->mb_decision = 2;
         }
-    break;
+        break;
 
     default:
         break;
@@ -284,25 +284,25 @@ static void open_audio(AVFormatContext *oc, AVCodec *codec, OutputStream *ost, A
     }
 
     /* create resampler context */
-        ost->swr_ctx = swr_alloc();
-        if (!ost->swr_ctx) {
-            fprintf(stderr, "Could not allocate resampler context\n");
-            exit(1);
-        }
+    ost->swr_ctx = swr_alloc();
+    if (!ost->swr_ctx) {
+        fprintf(stderr, "Could not allocate resampler context\n");
+        exit(1);
+    }
 
-        /* set options */
-        av_opt_set_int       (ost->swr_ctx, "in_channel_count",   c->channels,       0);
-        av_opt_set_int       (ost->swr_ctx, "in_sample_rate",     c->sample_rate,    0);
-        av_opt_set_sample_fmt(ost->swr_ctx, "in_sample_fmt",      AV_SAMPLE_FMT_S16, 0);
-        av_opt_set_int       (ost->swr_ctx, "out_channel_count",  c->channels,       0);
-        av_opt_set_int       (ost->swr_ctx, "out_sample_rate",    c->sample_rate,    0);
-        av_opt_set_sample_fmt(ost->swr_ctx, "out_sample_fmt",     c->sample_fmt,     0);
-
-        /* initialize the resampling context */
-        if ((ret = swr_init(ost->swr_ctx)) < 0) {
-            fprintf(stderr, "Failed to initialize the resampling context\n");
-            exit(1);
-        }
+    /* set options */
+    av_opt_set_int       (ost->swr_ctx, "in_channel_count",   c->channels,       0);
+    av_opt_set_int       (ost->swr_ctx, "in_sample_rate",     c->sample_rate,    0);
+    av_opt_set_sample_fmt(ost->swr_ctx, "in_sample_fmt",      AV_SAMPLE_FMT_S16, 0);
+    av_opt_set_int       (ost->swr_ctx, "out_channel_count",  c->channels,       0);
+    av_opt_set_int       (ost->swr_ctx, "out_sample_rate",    c->sample_rate,    0);
+    av_opt_set_sample_fmt(ost->swr_ctx, "out_sample_fmt",     c->sample_fmt,     0);
+
+    /* initialize the resampling context */
+    if ((ret = swr_init(ost->swr_ctx)) < 0) {
+        fprintf(stderr, "Failed to initialize the resampling context\n");
+        exit(1);
+    }
 }
 
 /* Prepare a 16 bit dummy audio frame of 'frame_size' samples and
@@ -349,10 +349,10 @@ static int write_audio_frame(AVFormatContext *oc, OutputStream *ost)
 
     if (frame) {
         /* convert samples from native format to destination codec format, using the resampler */
-            /* compute destination number of samples */
-            dst_nb_samples = av_rescale_rnd(swr_get_delay(ost->swr_ctx, c->sample_rate) + frame->nb_samples,
-                                            c->sample_rate, c->sample_rate, AV_ROUND_UP);
-            av_assert0(dst_nb_samples == frame->nb_samples);
+        /* compute destination number of samples */
+        dst_nb_samples = av_rescale_rnd(swr_get_delay(ost->swr_ctx, c->sample_rate) + frame->nb_samples,
+                                        c->sample_rate, c->sample_rate, AV_ROUND_UP);
+        av_assert0(dst_nb_samples == frame->nb_samples);
 
         /* when we pass a frame to the encoder, it may keep a reference to it
          * internally;
@@ -519,7 +519,6 @@ static AVFrame *get_video_frame(OutputStream *ost)
 static int write_video_frame(AVFormatContext *oc, OutputStream *ost)
 {
     return write_frame(oc, ost->enc, ost->st, get_video_frame(ost));
-
 }
 
 static void close_stream(AVFormatContext *oc, OutputStream *ost)